Sam bit his lower lip and took a deep breath. "Do you understand personal space?"

Castiel did not look bothered. "I didn't know that you would be here. I assumed you would be with your brother."

Sam really wanted to pull his jeans back up around his waist, but he didn't quite know how to tell his brother's angel to get his hands off his ass first. Castiel, however, didn't really seem to notice and was instead stroking his boxers.

"I've never seen panties this soft before," the angel continued, pinching Sam's boxers between his fingers.

"They're not panties," Sam yelped, jumping slightly "They're boxers."

"Boxers?"

"Yeah. What guys wear under their jeans," Sam told him, trying to twist out of Castiel's grasp, but Castiel's hold on his boxers was firm. He couldn't believe he was standing in a cramped motel bathroom with an angel holding onto his ass.

"I don't wear those," Castiel said slowly. Castiel's free hand strayed to his own crotch, as if to confirm that he was not, in fact, wearing boxers "Your brother doesn't wear those."

"He was very upset." Castiel stroked his thumb up and down the side seam of Sam's boxer and Sam suppressed a shudder. He was not about to get aroused by an angel touching him and talking about his brother. "I think it was because he didn't want me to know he was wearing pink."

"Yeah, well, laundry mistakes." Sam tried imagining his sixth grade drama teacher naked, but it wasn't helping his arousal. "They happen to the best of us."

"No, they were pink satin. They were very pretty." When Sam didn't know how to respond, Castiel explained, "I went and bought some of my own after that. They're very comfortable."

"You mean red silk?" Sam asked in a strangled voice.

"No, they were nothing like your boxers," Castiel told him softly. "Although your boxers are very nice, too."

Sam just made a low noise in his throat, halfway between distress and arousal. Castiel was going to notice it in a minute.

"Maybe I should buy some boxers. They look like they'd be freer than panties."

"Not exactly." Castiel looked down at his own crotch. "I find I prefer the softness of cotton. It's breathable and flexible and natural in my Father's creation."

His eyes wide, Sam just stared at Castiel. Castiel cupped his hand around Sam's ass, clearly still intrigued by the feel of his boxers. Sam's stared at the way Castiel's panties hid absolutely nothing about him.

"People would probably get the wrong idea." Sam tried to reach for his jeans where they had pooled around his ankles, but Castiel was too close to him for it to be easy or comfortable.

"The wrong idea?" Castiel asked, stepping closer to Sam and further into his personal space. Sam didn't have anywhere to go, trapped between the toilet and Castiel.

"That you're trying to hit on them. You know, like Dean does with the girls at bars."

"I've watched Dean hit on girls," Castiel said. "And he told me about what happens after. While you were separated, he took me to a brothel."

"A brothel?" Sam tried to do quick mental reassessment. Maybe Castiel did know what he was doing.

"Nothing happened," the angel reassured him. "Your brother rearranged a prostitute for me, but I couldn't take advantage of her in that way."

"Oh."

"But I wouldn't be taking advantage of you."

Sam frowned. "Dean put this up to you, didn't he?"

"He gave me some suggestions," Castiel admitted. "But... It was not a dare, if that is what you were asking. This is entirely my idea."

"Oh," Sam repeated. He'd felt a little less embarrassed at his own arousal when he saw Castiel's burgeoning erection, but now he just felt stupid that he didn't realise what Castiel was doing. He'd only watch Dean seduce women like this since before he hit puberty. "Maybe Dean wasn't the best mentor."

"Do you have any suggestions, then?" Castiel asked before he closed the space between them and pressed their lips together.